[clang] [NFC] Fix c++ style comment in c file (PR #112814)

[Abhina Sree via cfe-commits]

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@@ -8,7 +8,6 @@
 #include "clang-c/Documentation.h"
 #include "clang-c/Index.h"
 #include "clang/Config/config.h"
-#include "llvm/Support/AutoConvert.h"
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abhina-sree wrote:

Inside that header we guard the C++ code inside an `#ifdef __cplusplus` so it should work for both C and C++. Are you hitting any errors as a result of this header file? it is also guarded with `__MVS__` so no other platforms outside of z/OS should be using these functions

https://github.com/llvm/llvm-project/pull/112814